Adding cluster support for mongodb write behind

[chayim]

Adding the ability to create custom mongodb:// style connection strings. This adds support for mongo clusters, and even Atlas

[MeirShpilraien]

Looks good, my only comment is that maybe we want to follow the path of allow giving a callback for connection string so it can be read from db configuration, looks here:

rgsync/rgsync/Connectors/sql_connectors.py

Line 13 in ddcc906

return self._user() if callable(self._user) else self._user

[chayim]

Looks good, my only comment is that maybe we want to follow the path of allow giving a callback for connection string so it can be read from db configuration, looks here:

rgsync/rgsync/Connectors/sql_connectors.py

Line 13 in ddcc906

return self._user() if callable(self._user) else self._user

Does anyone use this? I saw the idea and thought... I'd rather not embed a DSN in a database. For the record I could understand embedding it in a redis key (interesting?).